Two upright pieces of slightly varying width, on a book cover in the Munich Library, represent a consul in the act of walking to his right, and carrying what is probably a congratulatory address to the Emperor, his hands being religiously veiled. Above and behind him is an Imperial Guard, with large shield and spear, his robe embroidered on the shoulders, and his neck encircled by a collar from whence hangs a bulla, just as we see them on the mosaic in St. Vitale at Ravenna. The narrower piece has a rigidly vertical design. Below is the full face figure of a man holding a long staff, and above, the upper portion of a figure of Victory, holding up over her head a wreath containing a bust of the Emperor, the exact enlargement of those Victories which so often stand on the arms of the curule chair (No. 17). Meyer considers that these two unequal pieces formed the two sides, but the complete want of balance in the composition makes Molinier’s opinion that they both formed the right side the more probable. This increases the number of pieces to seven, but the Victory having no border may have been sawn off the central plaque. On the other hand, in the five-piece panel at Ravenna (Fig. 10), the central plaque is divided horizontally by a beading, if not in two separate pieces. If we consider that these two pieces formed the right side, and multiply their combined width for the left side, and then compare the total of the two sides with the width of the horizontal strips, there is still ample space for a central plaque representing the Emperor. Meyer adds to the list of diptychs the celebrated five-piece tablet in the Barbarini Library at Rome. The upper and lower strips are of exactly the same character, and in the central plaque the Emperor (probably Constantine the Great) is seen on a rearing horse, under whose feet is a woman with her lap full of fruit, who personifies some conquered country. In the left piece is the figure of a soldier bringing a Victory, and the other side, which should have a representation like the Munich Consul, is lost. Molinier emphatically declares this could not have been a consular diptych, as there is no trace of inscription; but suggests that it was the cover of a book intended for the Emperor. There is one more diptych in exceedingly high relief, which may possibly be classed among the consular series, the date and subject of which is still a matter of much discussion. One leaf is in the Bargello at Florence (Fig. 5), and the other in the Vienna Museum (No. 57).